create an executable with custom msgs

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Hi,

I want to create a ros executable that uses a custom msg. I used catkin to make a package with a custom message. I ran catkin_make and copied the executable to another location the node seems to run fine (I put in print statements that are continuously executing). The topic I'm publishing is part of the rostopic list but when a rostopic echo mytopic results in the following: ERROR: Cannot load message class for mynode/mycustommsg. Are your messages built?

a rosmsg show mycustommsg shows the msg.

What should I be doing ?

Thanks.